#classDetailHeader{
    width: 960px;
    height: 53px;
    font-size: 16px;
    color: #545c63;
    line-height: 53px;
    margin-top: 18px;
    border-bottom: 1px solid #d9dde1;
}

#classDetailHeader span{
    margin-right: 64px;
    display: inline-block;
    color: #545c63;
}

#classDetailHeader span.active{
    color: #f20d0d;
    border-bottom: 2px solid #f20d0d;
}